• País
• Gran Bretaña (GB)

• Fabricante / Marca
• Marconi Co. (Marconiphone, Marconi's Wireless Telegraph Co. Ltd.), GB (not tubes - see also HMV His Master's Voice)

• Año
• 1950 ??

• Categoría
• Receptor militar

• Radiomuseum.org ID
• 366313

Haga clic en la miniatura esquemática para solicitarlo como documento gratuito.

• Numero de valvulas
• 9

• Válvulas
• CV131 CV138 CV138 CV131 CV131 CV140 CV131 CV131 CV136

• Principio principal
• Superheterodino con paso previo de RF

• Gama de ondas
• OL y OC solamente (sin OM)

• Tensión de funcionamiento
• Alimentado desde otro equipo o aparato principal. / Fil: 19, B+:250 Volt

• Altavoz
• - Este modelo usa amplificador externo de B.F.

• Material
• Metálico

• de Radiomuseum.org
• Modelo: HF/MF Receiver AD 108 - Marconi Co. Marconiphone,

• Forma
• Chasis (tambien de autoradio)

• Ancho, altura, profundidad
• 4 x 8 x 12.5 inch / 102 x 203 x 318 mm

• Anotaciones

• The Marconi AD108 is a compact, nine‑valve HF/MF superheterodyne aircraft receiver engineered for high sensitivity, stability, and reliable operation under demanding aeronautical conditions.

  Designed for reception of CW, MCW, and RT signals, it covers either 2–18.5 MHz (HF) and 260–510 kHz (MF) or an alternative 2–9.1 MHz (HF) and 150–510 kHz (MF) configuration.

  Circuit Architecture

  • Selective RF stage providing strong image‑frequency rejection
  • Temperature‑compensated first heterodyne oscillator to minimise drift under varying ambient conditions
  • Suppressor‑grid injection mixing, reducing oscillator pulling at high frequencies
  • Two IF amplifier stages with bandwidth determined by the system switch; a crystal filter is introduced in the narrow‑band position for 1 kHz selectivity at 6 dB
  • Front‑panel BFO control adjustable ±5 kHz for CW/MCW reception

  Audio & Output

  • Output stage matched to 33 Ω, delivering 225 mW undistorted audio with negative feedback to stabilise performance across one to three headsets.

  Power System

  • Powered via a rubber‑suspended rotary transformer from the aircraft’s 28 V DC supply, generating 250 V HT and regulated 19 V filament voltage.

  Controls & Remote Operation

  • All operating controls are front‑panel mounted, with full duplication (except BFO) on a remote controller.
  • Remote tuning uses a flexible mechanical drive, while other functions are motor‑driven using Type 1263 ratchet motors with thermal overload protection and interference suppression components.

• Peso neto
• 11 lb (11 lb 0 oz) / 4.994 kg

• Mencionado en
• - - Manufacturers Literature

• Autor
• Modelo creado por Fabio Franciosi. Ver en "Modificar Ficha" los participantes posteriores.

• Otros modelos

• Donde encontrará 510 modelos, 349 con imágenes y 322 con esquemas.
  Ir al listado general de Marconi Co. (Marconiphone, Marconi's Wireless Telegraph Co. Ltd.), GB (not tubes - see also HMV His Master's Voice)